fix: 2026-06-09 full-codebase audit hardening

Validation: shared NaN-guarded Zod coercion helpers in schemas/common.ts replace
the raw number|string transform idiom across every schema (the root-cause NaN bug
class); emailOrEmpty + lenient isoDateString/timeString.

Security: roles privilege-escalation closed; refresh-token family revocation on
reuse; TOTP uses config params; read endpoints permission-guarded; received-invoices
gross VAT on all paths; orders-pdf custom-items authz.

Concurrency: $queryRaw SELECT...FOR UPDATE locks in ascending-id order (warehouse
confirm/cancel, attendance lockUserRow); uniqueness checks moved into create
transactions (TOCTOU -> 409); deterministic id tiebreak on second-precision
timestamp ordering (plan resolveCell/resolveGrid, warehouse FIFO).

Frontend: Rules-of-Hooks fixed across ~14 pages + PlanCellModal; UTC-date persisted
fields; dashboard invalidation gaps; stale-closure confirm bugs.

Tooling/tests: ESLint flat config (react-hooks/rules-of-hooks = error) + Prettier;
tsconfig.test.json so tsc -b type-checks the tests; removed 3 dead deps; npm audit
fix (8 -> 3). Suite 195 -> 247 (happy-path auth, FIFO oldest-first, flakiness fixes),
isolated on app_test via .env.test with a hard-throw setup guard.

Gates: tsc 0 | build 0 | vitest 247/247 | eslint 0 errors.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/admin/components/warehouse/ItemPicker.tsx

@@ -5,6 +5,7 @@ import TextField from "@mui/material/TextField";
 import CircularProgress from "@mui/material/CircularProgress";
 import Box from "@mui/material/Box";
 import Typography from "@mui/material/Typography";
+import useDebounce from "../../hooks/useDebounce";
 import {
   warehouseItemListOptions,
   type WarehouseItem,
@@ -26,9 +27,11 @@ export default function ItemPicker({
   itemName,
 }: ItemPickerProps) {
   const [inputValue, setInputValue] = useState(itemName ?? "");
+  // Debounce the search so the list query doesn't fire on every keystroke.
+  const debouncedSearch = useDebounce(inputValue, 300);
 
   const { data, isFetching } = useQuery(
-    warehouseItemListOptions({ search: inputValue, perPage: 20 }),
+    warehouseItemListOptions({ search: debouncedSearch, perPage: 20 }),
   );
   const options: ItemOption[] = data?.data ?? [];